1. TOPIC: ECOLOGY CYCLES OBJECTIVE: Describe how matter cycles in and out of an ecosystem in water, oxygen , carbon and nitrogen cycles.

2. HYDROLOGIC CYCLE: Water cycles through the environment.
The hydrologic, or water, cycle is the circular pathway of water on Earth.
Organisms all have bodies made mostly of water.
precipitation
condensation
transpiration
evaporation
water storage
in ocean
surface
runoff
lake
groundwater
SEE PAGE 413

3. OXYGEN CYCLE:Elements essential for life also cycle through ecosystems .
The main processes involved in the oxygen cycle are photosynthesis and respiration.

4. Carbon is the building block of life..is an organic cmpd.
CARBON CYCLE
Carbon is the building block of life..is an organic cmpd.
The carbon cycle moves carbon from the atmosphere, through the food web, and returns to the atmosphere.
Carbon is emitted by the burning of fossil fuels
Remember we exhale CO2 that plants take in to make sugar for their food.
fossil fuels
photosynthesis
carbon dioxide
dissolved in water
decomposition
of organisms
respiration
carbon
dioxide
in air
combustion

5. NITROGEN CYCLE: mostly underground…78% of atmosphere made of nitrogen but most organisms only can use nitrogen when in form of ammonia or nitrate….so
Nitrogen fixation – Bacteria convert gaseous
nitrogen into ammonia = live in roots of plants
- Nitrifying bacteria- change
the ammonium
into nitrate
which is used by plants
to make AA then animals
eat plants and
it is CYCLED back to
atmosphere
nitrogen in
atmosphere
animals
denitrifying
bacteria
nitrifying
ammonium
ammonification
decomposers
plant
nitrogen-fixing
bacteria in soil
bacteria in roots
nitrates
nitrites

6. PHOSPHORUS CYCLE: all this cycle takes place at and below ground level…not atmospheric and gaseous states